Apple's just-announced iPhone 4S is the first iPhone to utilize the Bluetooth 4.0 specification (though it is already in use in the latest MacBook Air and Mac mini), which focuses on making the wireless protocol use dramatically less power, and offers lower latency and tougher encryption. The standard Bluetooth used in most recent Apple devices is now referred to as "classic" Bluetooth, while the new 4.0 specification features the option of using as little as one one-hundredth as much power in its most idle state.
